Spieal pinions



6 Sheets- Sheet 1.

(No Model.)

B. P. & H. 0. WALTER.

MACHINE FOB. CUTTING SPIRAL PINIONS. No. 412,215.

Patented Oct. 1, 1889.

@Mlp (6 #7155 (No Model.) 6 Sheets-Sheet 2. B. P. 86 H. G. WALTER.

MACHINE FOR GUTTINGSPIRAL PINIONS.

130.412.215. I Patented Got. 1, 1889.

N PTERS PhcwLilhognphcr, Washing- 10". D.C-

(No Model.) 6 Sheets-Sheet 3. E. P. & H. 0. WALTER.

MACHINE FOR CUTTING SPIRAL PINIONS.

I No. 412,215.

Inventors,

962W, 6 WV Patented Oct. 1, 1889.

ll IIIIIIIIIIIA 6 Sheets-Sheet 4.

(No Model.)

B. P. & H. G. WALTER.

MACHINE FOR CUTTING SPIRAL PINION'S.

No. 412.215. Patented Oct. 1, 1889 N. PETERS. PhcRoUlhogmp-wmWashingflm. D C,

(No Model.) 6 Sheets-Sheet 5.

E. P. 8: H. G. WALTER.

' MACHINE FOR GETTING SPIRAL PINIONS.

No. 412,215 Patented Oct. 1, 1889.

46 6464394 a I MW N. Pains. mowummm wmmm a c.

6 Sheets-Sheet 6.

' (No Model.)

B. P. 85 H. O. WALTER.

MACHINE FOR CUTTING SPIRAL PINIONS.

Patented Oct. 1, 1889.

egses UNITED STATES PATENT. -rrrcn.

EDW ARD P. W'ALTER AND HENRY O. NALTER, OF BRIDGEPORT, CONNECTI- CUT,ASSIGNORS TO MANNING, MAXWELL dz MOORE, OF NEYV YORK, N. Y.

MACHINE FOR CUTTING SPiRAL PlNIONS.

SPECIFICATION forming part of Letters Patent No. 412,215, dated October1, 1889.

Application filed June 15, 1889. derial No. 314,363. (No model.)

To all whom it may concern: A is the bed, preferably a hollow casting,

' Be it known that we, EDWARD P. WALTER upon which the operative partsof our maand HENRY O. W'ALTER, citizens of the United chine aresupported, and which we prefer to States, residing at Bridgeport, in thecounty construct with a bowed extension in front, the

of Fairfield and State of Connecticut, have inbetter to mount thework-carrying mechan- 55 vented certain new and useful Improvements ism.

in Machines for Cutting Spiral Pinions; and The moving parts of ourmachine may be we do hereby declare the following to be afull, said tobe divided in to and treated under two clear, and exact description ofthe invention, separate heads, viz: the tool-carrying mechsuch as willenable others skilled in the art anism, which has a reciprocatingmovement, 6o to which it appertains to make and use the and thework-holding mechanism, which has same. a reciprocatory, and in additionthereto and Our invention relates to certain new and simultaneoustherewith a rotary, movement. useful improvements in machines forcutting The tool-holding mechanism consists of the spiral pinions or forproducing any descripcolumns 13, upon whose tops is mounted the 65 tionor pitch of thread upon shafts or other guideway 0, upon which thetool-carriage D work of cylindric form, and has for its object isarranged to travel. The guideway is holto provide mechanism partlyrotary and in low and the carriage surrounds it. A lug E partreciprocatory, whereby the cutting of projects from the said carriageinto the intesaid threads may be economically and raprior of theguideway through the lengthwise 7o idly accomplished; andwith these endsin view opening, which clearly appears at Fig. 3.

' our invention. consists in the details of con- F is a rod, which isscrew-threaded, except struction and combination of elements hereas toits extremities, and which passes longiinafter fully and in detailexplained, and tudinally through the guideway. It is adapted thenrecited in the claims. to turn in bearings formed in sleeves G at Inorder that those skilled in the art to either end of the guideway. Thescrewwhich our invention appertains may more threaded portion of the rodpasses through fully understand both how to make and use the lug E,which is suitably threaded, and our improvement, we will describethesame thus the screw carries the tool-carriage upon 3 in detail,referring by letter to the accompathe guideway, as will hereinafter morefully nying drawings, which form a part of this appear. specification,and in which- H are clutch-disks mounted rigidly on the Figure 1 isafront elevation of our machine; ends of rod F, and I are pulleysjournaled Fig. 2, a plan view thereof; Fig. 3, a central upon sleeves G,(see Fig. 3,) which pulleys, to-

35 longitudinal vertical section through the bed gether with the disks,form the friction-clutch 8 5 and tool-operating mechanism; Fig. 4, asecand driving devices for the screw F and the tional elevation of thework-operating mechtool-carriage. anism; Fig. 5, an end view, partly insection, For a more particular description of the of the work-operatingmechanism, the gears clutch above mentioned we would refer to 4 beingremoved 5 Fig. 6,acentral vertical oross- Letters Patent No. 3293M,granted to us the 0 section of the tool holding and operating de- 27thday of October, 1885. vice; Fig. 7, a detail sectional elevation of Uponthe rod F, near one end, are two fast the tool carriage and toolmanipulating collars J, between which is a loose sleeve K. means; Fig.8, a plan of the same; Fig. 9, a L is a one-toothed pinion which engages45 section at line a: as of Fig. 7, and Fig. 10 a with the loose sleevelast referred to, and M central vertical longitudinal section of said isa lever connecting the pinion aforesaid carriage and tool-manipulatingmechanism at with a screw-threaded shippingmod N, which the line w an ofFig. 8. extends longitudinal of the guide way above Similar lettersdenote like parts in all the the tool-carriage.

5o figures of the drawings. 0 are shipper-nuts, threaded and adapted I00to travel on the rod N, and P is an open shipper-block mounted upon thetool-carriage and loosely surrounding the rod N.

By the clutches, screw-rod, shipper-rod, block, and nuts the reversal ofthe machine is effected, as will hereinafter be explained somewhat morein detail.

The work-holding portion of our machine is as follows: A hole K in thecenterof the bed of the machine and midway between the columns isclosely fitted by a downward extension Q from the turn-table R, (seeFig. 4,) and this extension forms a pivotal point about which said tablemay be swung. To secure the table at any angle relative to the travel ofthe tool-carriage, a circularinverted- T-shaped track L is formed in thebed around the hole last mentioned, (see Figs. 4: and 6,) and head-boltsS (see Fig.2) on the table,'extend downward and engage with the track.

T is the work-carriage mounted in ways upon the turn-table, and U is abracket extending downwardly from the end of the Work-carriage, asaforesaid.

V is the driving-screw, shouldered into the bracket U and threadedthrough the end of the turn-table. (See Fig. 4.) This screw V carries agear W and a handle X, as seen at Fig. 4. By the screw and handle thecarriage is moved upon the turn-table backward or forward. I

Y is a gear mounted on a short shaft M, which is journaled in the lowerextremity of the bracket U, and a beveled gear Z is secured upon theother end of the said short shaft.

A is a swinging arm, upon which an idlegear L, meshingwith gears W andY, is journaled. Y

B is a vertical shaft arranged in journals formed on the bracketU, and Cis a beveled gear rigid on said shaft and meshing with and receivingmotion from gear Z.

D is achuck mounted upon the carriage T in a bearing E, which permitsrevolution to the chuck therein. At its rear end the chuck is providedwith gear-teeth, (see Fig. 5,) which mesh with a worm F on the verticalshaft B. Secured upon the top of the worm is an index-plate G, providedwith holes afor various graduations of work, as is seen in ordinaryindexing-machines.

Upon the top of the shaft B is rigidly mounted an arm H, having thereina pinN, to engage with the holes in the index-plate.

I represents a pinion properly held in the chuck and supported as to itsouter end in a rest J, which is secured upon the top of thework-carriage.

The operation of our improvement is as follows: The pinion-blank isfirst placed in position, as seen at Fig.1. The pitch is regulated bythe speed of the gear Y, which controls the revolution of the gear D andchuck E, and said speed is increased or decreased according as thediameter of the cog Y is greater or less than the diameter of the cog W.Thereby 'the rotary movement of the blank is made to bear the properproportion to the forward motion of the carriage and work, which latteris effected by means of the screw V, so that the dual motion corresponds with the helix of the pinion to be cut. The reciprocations of thecutting-tool O and its carriage are rendered automatic by theshipper-rod and its nuts. As either of said nuts in the course of travelof the tool-carriage is engaged by the shipper-block, the rod is carriedwit-h the carriage for a sufficient distance, so that through the lever,one toothed pinion,and loose sleeve the disk then in engagement with thepulley is thrown out of said engagement and the other disk is moved intocontact and engagement with its pulley. The pulleys are driven inopposite directions. Adjusting the shipper-nuts on the rod determinesthe stroke of the tool.

The raising and lowering 'of the cutting-tool is accomplished by meansof the threaded rod A, which runs through a stationary nut B, projectingfrom the carriage D,'and is shouldered, as seen at 14 and 15, directlyagainst the tool-head O, which latter is gibbeted within ways 13,secured to the carriage. A hand-wheel E is secured to the top of saidrod A, and by manipulating said wheel the said rod is operated to causethe head 0 to slide in its bearings. The cutting-tool O is eccentricallypivoted, as seen at 16, within the head 0, and rests in normal positionfirmly against the rear wall of said head, the rear upper corner of saidtool being rounded, as seen at 17, to permit of the tripping of saidtool on its backward movement along the work. A spring 18, bearingagainst the front edge of the tool and the front wall of the head,renders the tripping action resilient.

We do not deem it necessary to enter into further description of theoperation of the tool and tool-head, since we lay no claim to them, and,moreover, they are precisely the same asis exemplified in the popularplaning-machines now in use.

By'the tool (reciprocating, as aforesaid,

pitch of the spiral, and is there secured.

Then the tool is permitted to cut into the blank diagonally andtangentially thereto, taking out a small chip. Then at the backwardmovement of the tool through the handle, gears, 850., the blank isturned slightly to present fresh metal to the tool. Thus the groove isplaned out little by little, the blank being moved forward and rotatedat each backward stroke of the tool until the groove has been cut thewhole length of the blank. The work-carrying mechanism is then rotatedbackward, when by the indexplate and handle the blank is properly turnedfor the cutting of the next groove, when the Ice same process isrepeated. The exact manner in which the involute groove is cut by thetruncated-wedge-shaped tool is very difficult of explanation, and we areable only to say that it arises from the compound forward and rotarymotion of the blank and the reciprocating movement of the tool whosetravel is tangential to the cylinder. As the tool cuts, the first partof its stroke is devoted to finishing the walls of the groove left roughbya former out, the middle of the stroke acts both upon the walls andplows out the bottom of the groove, and the latter part of the strokeroughs out metal preparatory to the next cut. The successive cuts formthe beginning" act upon the groove, which is finished as the successiveportions of the latter, by the rotation of the blank, pass below thehorizontal plane in which the tool travels.

Having thus described our invention, what we claim is 1. Thecombination, with the bed, the turntable, the carriage mounted thereon,the chuck arranged upon the carriage, and means, as described, wherebyforward motion may be imparted to the carriage and both forward androtary motion to the chuck, of the cutting-tool and carriage mountedabove the work-carri age and adapted to be reciprocated, substantiallyas set forth.

2. The combination, with the tool-carriage and tool adapted to bereciprocated upon the guideway, of the work-carriage adapted to travelupon ways beneath the tool, the chuck mounted upon the carriage, and thegears and pinion whereby rotary motion is imparted to the chuck,substantially as described.

3. The combination, with the guideway supported upon columns from thebed, of the screw extended longitudinally through the guideway, thetool-carriage mounted upon the guideway and carried by the screw, andthe pulleys and clutch-disks mounted at either end of the screw,substantially as and for the purpose set forth.

4. The combination, with the guideway, of the screw longitudinal thereofand the toolcarriage carried by said screw, the pulleys andclutch-disks, and the shipper-rod, its nuts, and connections whereby theengagement of the disks and the movement of the tool-carriage isreversed, substantially as specified.

5. The combination, with the bed of the machine, of the turn-tablearranged thereon, the carriage mounted upon the turn-table andsupporting the chuck, the driving-screw shouldered in the carriage andthreaded in the turn-table, the gears and upright shaft, and the wormmeshing with the gear on the chuck, all arranged as and for the purposeset forth.

6. The combination, in a machine of the character described, of thefollowing mechanical element, to wit: the traveling toolcarriage and itstool, the longitudinally-moving work-carriage beneath the tool, thechuck mounted and adapted to rotate upon the work-carriage, andmechanism, as described, whereby the combined rotary and forward motionsare imparted to the chuck, substantially as set forth.

'7. The combination, with the bed, of the turn-table, the movablework-carriage and the chuck geared at its rear end, the gears V and thecarriagedriving screw, the vertical shaft, index-plate, and pin, and theworm meshing with the gear upon the chuck, substantially as described.

In testimony whereof we aiiiX our signatures in presence of twowitnesses.

EDWARD P. WALTER. HENRY C. WALTER.

Witnesses S. H. HUBBARD, S. S. WILLIAMSON.

